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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afb62eb511e9639d25ef8c2150deda6eb7e98075dc0100b7e9b24d5e9a3987de' 
  AND token = 'y7NAhA3n1FkV6vaF8wbM8/dKbfNlgiqhV0OgVTMbExs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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