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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad8fe7d3c59df94854208502933d63249ead6ac9626e78fff7fd829737eca87' 
  AND token = 'Xl20SHX2UHPXrm5hPs3PrO1asqFJbUY3e8I6cc1fUaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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