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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '704ec61f01cf6d831d047df2f16e024569adf02f5037622db18462bf167e23f0' 
  AND token = '2ddtkH5RFtR9+sEW9y8wTCPCncBm1tZZWvOSw/ANrzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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