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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fc51b0977da9e5fe1801974cb00d39bbdc7087c9ef2eb73a70ff7353f4421ca' 
  AND token = 'DOIwHg30BdGA+hg50J2g3YUo4h9/SatPstNgIeZVIes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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