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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2c20e830d8f6adab196060a7a200e33a3f0c47da096eb018e6acd42bc16dd82' 
  AND token = 'ClCReqsOooIVI9XkRWW0E4c2xvg5em5nywkUpMjaSHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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