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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '930f5dadcb485cf19961626c319a7ada498e2cd5e2aaf5428c3db45da62cfb83' 
  AND token = '4JZDMOSRxV1dypSB+AzI5rS+4RX+azQqQGfVX5cLiR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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