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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b9c0e7ef2c7bdf29ff9cafe38b3e29ffffbf700ee9752889e70e1b59fa942db' 
  AND token = 'ngNHigBKJmXtTY4+pL/daXFMiXE5fDu91zBRzo2TCSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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