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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abaacf098df1e735ece945966a1a9deaa02f1497d70cdaba9eaea3f16d4aad81' 
  AND token = 'sYyCRmBQVQSw1M28fkyS/y3OAjGsusl2edh2nosNwFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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