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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac1da5b622f01b66df238bb7ebb7ef737bbb1c12f6da2199e341a81e1b273b7' 
  AND token = 'PbHD5iEyNdnnxdNYn+eb1zRX/x5ZUCVnVCGf2QJfPV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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