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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a326d40df4c7b5465e15b01935b412c9e8c6d3e83e18eb68fa7fca3d18b08e' 
  AND token = 'gY489wnOnN0z6C6CURCf8LmkfHcU32uTViczHMvNnV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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