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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a76cefe0a9491756777a00c515b57e7ae6114490ac1b554184e3dcb3dcfdcec' 
  AND token = 'G5F6SrW3+Nr1l5AFcVli4N7O0zHU0bDKaHk3TOyZ7Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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