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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9175e94af31504d6d5382998b9b5e5ff86864acddefe2c8d772ccfbdb3f395b3' 
  AND token = 'AOX145beYsiI/em8pWfhOspySMp6g8Vyuw2yIXuJv8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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