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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e00a7e8a209c82dcf9e839a21d990f6cd28a6764cec2432d0167c68902f2fd90' 
  AND token = '4LriBpUIkbPpSMi8UIVQAtR1RCreZ8l+egE1ieFJWl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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