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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91510461da91fe78a69662ac0a11c520e49d1c59e2b71b9a570b70e52b3171c7' 
  AND token = 'XebLA0S+vll3MOl5H6IxhXQ/YtK2JfS9hDuu5VoP+xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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