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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a2c7bda50e153b32b448355055366cbad6546d36ab8b0f9afd05133e24bafd3' 
  AND token = '2zHkK9IL20x5+skFUXqRlbcBRXv2Jbneh3ikq7FVkzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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