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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54f9b5e5cbd171567b7dc3252ee23cddb2b7cc4efd0782ee9be845a20c6d8a9d' 
  AND token = 'J2OBmoo5OHkErhzmw2hRH48Awf43ZQ51XnuTiqiHQCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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