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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dacd9a6184296dfb9b937de9a5a3fec7334bf32b5ee6d28697fb284727859b0' 
  AND token = 'PzdZRkSacksdDbA5IdjuaiUqcKGNYDYwbk7Am54tiO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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