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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c76a5805bfad3ef57fc7efa1779f4f6547d41854c4b5be64bfb11000715ebd' 
  AND token = 'IsUHFAlt3UoRmAX8iJKXeaQ1HX3IZTTxNokd7trhF9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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