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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b9c02ba69f543402eb214cb10e586a5e7473c7f9e91bdd92b8420030c4bbfe' 
  AND token = 'O/Mggt1BiQiExdSIoUE7E5N0t2OcA/FHgcX9chXxiAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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