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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fe420a4077175dd5923e56969b24d9ed32a96ab3471e5baaa1b70d5e5e8ae3d' 
  AND token = 'XxIDb+1zh9Nsq+xzZmfgYb7V6nrv6lGm0XLF6nzkYH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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