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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '986236b38a90d5739697d6af46f94b72c8369b6cbe3738e03af07313ca47d3fa' 
  AND token = 'UFFzmt00eRUKFTfHTrbKEVkcXPQAN6xGbCG39xhBLJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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