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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68801cca51277a14776ecbb328cd01893dc6283da9f808c4286069338fa568ee' 
  AND token = 'es0tCWE6jDL7WRfQ19vgvI3j6wrmSat8jhWjGe0wXMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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