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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd41a2b239f84664a066a0062a641f46b1b3034bc9728f219ad9aef4869e94c' 
  AND token = 'WqEEQCcV4fH675zfiCvWU7xBtC9mxnpHB6ztYEYXsrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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