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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44064d595de7617bd95aaa122957f70a5fbcafd6045960e08d85e98bd42ee93b' 
  AND token = 'mvFEpllFcD338Glii38owpqa9t5rHbxnbA5TQ64xeMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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