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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bdf187ce5ed4879a6d7de0de19717437f15cfd60cf6e18094d10b6b4ebf9b2d' 
  AND token = 'yjL4vOWENcQ3368PU3Nryj6f1fKvSe+9mbtaAY6hyzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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