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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dc2d8d71b37b0d308f0e48bdc6db65831f1c25a2a797e384e991936e6305b23' 
  AND token = 'ARlenieGeGZ0h+Xz248A9kVreWBSsyw3RNUq7ocubCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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