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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31aff5c1903882e3dd026c17df27a5779a9cde3e0c89adc9c1ffd70a03a7a8f4' 
  AND token = 'HOxUJb1O0Hg7ZhsxU8aXdu7oBcguUtzvkx5xTXD6ZXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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