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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f6fe4d90691cd47d246ceb77d31bc0cef8f2b2d0ae7060cc8f45f809e95392' 
  AND token = 'ctUbpg1ve1rjH2UY2G1go5IwgOjibrWiwULw3U19hnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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