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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1031fb7eba98c879057132c7e7c2e52fe5a3dc2ba33758417ba89ef2cfe8637f' 
  AND token = 'GfWyI0GWG0M0VafXoAt/SVdeUyzqvzulj6Emx4hRNNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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