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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a504b961ddb538c0fe246d085f892671ceb8c0d096d7d5cfeb9d84f35ae8bb62' 
  AND token = 'JVAMkZ8yxhCK3cHHHn7hLZcxTurWhiVzAErDPh1Fdgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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