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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ebcf448e174a71b4472159e89ebd1870bb32f2fb8d8fb0ea2a919b1071e9086' 
  AND token = 'z9DHFr5he1jfdbwfkXQCg+HKm6r9sySgglllnmDQ2J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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