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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a2f6392e2d5be05771c31408535febbf07015cfd53b55663421682efd1a7ce' 
  AND token = 'A0Fj3lUaqP7UmzAUDWGHg5HT2dLwk1nRYPyqYQZtU9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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