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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75c6706f9f0637d6e3c8e9503d23a9e36b482deb1959089fcaad1dc976743379' 
  AND token = '3KuWK0XQDFHyO/BreuMcMG6kmWGYwS11Op2mM9TFoLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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