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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee7dcac1e5330c3460ab2114aad1cd4373a799ea1a8671d579f4e8ce783176d' 
  AND token = 'dhqllCdH4kPvzyugZoVADYYSfdY8BM059vLn4arc4fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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