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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba9585d7d3570eea27ee347aa49f1c8583b35e0ac6f64d2244dd4e7aa3e808a' 
  AND token = 'z44cdY8DFT30JO6VVWbmBsNS7mFIdeCqXb/8Abj3Pqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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