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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eac0cf03af857a07bcedebdcd3ae68bc63e90892ffd8e3b8e8715f54388b5ff' 
  AND token = '+S8tbDo57KBkSnQoUJGllUd3+7ThafGo1GiZFp5v1Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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