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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6abb9f63760459b48b69b9835ed7690a71e403a94670d6e8f13665e900c95e0' 
  AND token = '0U7wgt7tevWnHHmrwG75c5odX7muIcBkFu5bIjHA31Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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