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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcce198de4ad3e68e7d12d7a08e9a199f417e402a4738c1a01afcb4f75e17e3c' 
  AND token = 'mBx3RBqvq+am5YBGLpoDKRF3CBSemz+2M+behE6/3ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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