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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf71e056fa3227ab2a64d065e9fc38ccd62d0c24d821caace89bd73d43ca9e8' 
  AND token = '0zvYj/SqieDenhbmShsM4QTR5rIp1E4T0S1QPIVZyZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}