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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '763652a74f657d0f76e0057bad90b06160ff85fd749331a623d191e2521d364c' 
  AND token = 'WlTN7XJED8WyyRrdt/NwDmc08TiM6C4cJ8n8aQuhc+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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