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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe080f2784f3ce3cd82e3e4a1a8ea41af54373f7c2a2da9cf19838719e16cb7' 
  AND token = 'FFFfgnehiJhavLTsCQea4d/tfKHlj7a1P9GE5dePcXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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