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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc690aef2f275962f21cba1e0841240f032593fc1c2cb963f688cd691e54e36' 
  AND token = 'L55cloC5v0MSHjAbiMZqQV5wbD5vrFRXD2LeIPttBZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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