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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee2f2f87ae8e633738434de5390d2bc618d13bc2c887ce4fc072f6e44809d27' 
  AND token = 'OihQVvT4+S2KBjTDHfXqkhRtnF9rEjFSgTEWI70ippI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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