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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '613ef49604e69d18d51777aaf4c7e95f058e51d47d633a2dac41b982e7aec8b9' 
  AND token = 'yd0gGMAmb4SUcSZXs18R+CKprv/eHkxnNkekFvvhbrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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