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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9abec13974772b5d36198e05dc4ce8328f324c3fb92a7e84cea4110b89f99652' 
  AND token = 'JxT8a1Ob3wxCRePn+H39ZuLteVLgjHpaojXBysHJ9ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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