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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f7a9dd201b56a6ca06dcef054c717b4af4e6f19a6297f0cda23081fda173ed' 
  AND token = '+l9VN3BbmNsn4OX0X6b80Wcanwkujva5gT4FvUsH8/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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