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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c84e9ad56e5a20b0a91fa1aa7fb650b305211aabe161c638ac781aea302831d' 
  AND token = 'efq+8paLPTE8/YzmRStkwhpD7wJntARXiHlVaTzHBhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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