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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d6f2b4eb841333500b1e5b26efac0e93ff38e92a05e623bdc28f49890e9689' 
  AND token = 'zOtRqNbHDYX/GvntcupOVbQsjceeeSXX7Hfbgys+qh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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