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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4864a7c5893a44e1f99e6954b5b5d7b91734ec3c337cf3cdc084d293c5385fc' 
  AND token = 'BR354Bta1O611Ry0pGzjFCaLkCfPo5xuRZ8w5Mu2AmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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