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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e57165f27635202cd8c3b432ded18d4f39a62fdbc906e35d8ffe2f225e83a343' 
  AND token = 'qUNZpMsWltHolDuQ1jjNYmC0ru3huG2tBygxp4ESxeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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