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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea1b4a5c27045ca58446a68ae88adde7ec025553a98d1109f04fbc2de4a1be7' 
  AND token = 'Zy4qAMKe2eP+G+qgTOSLBdLrESHezTwszkadET/rbqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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